Migrants arrive at the Hungarian-Austrian border in Nickelsdorf, Austria, Saturday, Sept. 5, 2015, where they came from Budapest as Austria in the early-morning hours said it and Germany would let them in. (AP Photo/Petr David Josek) (The Associated Press)

A woman and her children sit as they have boarded a bus provided by Hungarian authorities for migrants and refugees at Keleti train station in Budapest, Hungary, Saturday, Sept. 5, 2015. Hundreds of migrants boarded buses provided by Hungary's government as Austria in the early-morning hours said it...